From: Brett Gordon <beretta42@gmail.com>
Date: Wed, 25 May 2016 13:19:42 +0000 (-0400)
Subject: coco3: fix scroll_down().
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=f56f05fd54742528ade5803a8ea2f6f0bfb2fd44;p=FUZIX.git

coco3: fix scroll_down().
---

diff --git a/Kernel/platform-coco3/video.c b/Kernel/platform-coco3/video.c
index 190d0bf3..db0aff2f 100644
--- a/Kernel/platform-coco3/video.c
+++ b/Kernel/platform-coco3/video.c
@@ -81,7 +81,13 @@ void clear_across(int8_t y, int8_t x, int16_t l)
 	map_for_kernel();
 }
 
-/* FIXME: these should use memmove */
+static void rmemcpy( unsigned char *dest, unsigned char *src, size_t n )
+{
+	unsigned char *d=dest+n;
+	unsigned char *s=src+n;
+	while( s != src )
+		*--d = *--s;
+}
 
 void scroll_up(void)
 {
@@ -94,7 +100,7 @@ void scroll_up(void)
 void scroll_down(void)
 {
 	map_for_video();
-	memcpy(curpty->base + VT_WIDTH*2, curpty->base,
+	rmemcpy(curpty->base + VT_WIDTH*2, curpty->base,
 	       VT_WIDTH*2 * VT_BOTTOM);
 	map_for_kernel();
 }